package org.ehe.common.core.utils;


import com.jcraft.jsch.*;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.util.Properties;
import java.util.Vector;

/**
 * 类说明 sftp工具类
 */

public class SFTPUtil {

    private final Logger LOG = LoggerFactory.getLogger(SFTPUtil.class);

    private ChannelSftp sftp;

    private Session session;
    /**
     * SFTP 登录用户名
     */
    private String username;
    /**
     * SFTP 登录密码
     */
    private String password;
    /**
     * 私钥
     */
    private String privateKey;
    /**
     * SFTP 服务器地址IP地址
     */
    private String host;
    /**
     * SFTP 端口
     */
    private int port;


    /**
     * 构造基于密码认证的sftp对象
     */
    public SFTPUtil(String username, String password, String host, int port) {
        this.username = username;
        this.password = password;
        this.host = host;
        this.port = port;
    }

    /**
     * 构造基于秘钥认证的sftp对象
     */
    public SFTPUtil(String username, String host, int port, String privateKey) {
        this.username = username;
        this.host = host;
        this.port = port;
        this.privateKey = privateKey;
    }

    public SFTPUtil() {
    }


    /**
     * 连接sftp服务器
     */
    public void login() {
        try {
            JSch jsch = new JSch();
            if (privateKey != null) {
                jsch.addIdentity(privateKey);// 设置私钥
            }

            session = jsch.getSession(username, host, port);

            if (password != null) {
                session.setPassword(password);
            }
            Properties config = new Properties();
            config.put("StrictHostKeyChecking", "no");

            session.setConfig(config);
            session.connect();

            Channel channel = session.openChannel("sftp");
            channel.connect();

            sftp = (ChannelSftp) channel;
        } catch (JSchException e) {
            e.printStackTrace();
        }
    }

    /**
     * 关闭连接 server
     */
    public void logout() {
        if (sftp != null) {
            if (sftp.isConnected()) {
                sftp.disconnect();
            }
        }
        if (session != null) {
            if (session.isConnected()) {
                session.disconnect();
            }
        }
    }


    /**
     * 将输入流的数据上传到sftp作为文件。文件完整路径=basePath+directory
     *
     * @param basePath     服务器的基础路径
     * @param directory    上传到该目录
     * @param sftpFileName sftp端文件名
     * @param input        输入流
     */
    public void upload(String basePath, String directory, String sftpFileName, InputStream input) throws SftpException {
        try {
            sftp.cd(basePath);
            sftp.cd(directory);
        } catch (SftpException e) {
            //目录不存在，则创建文件夹
            String[] dirs = directory.split("/");
            String tempPath = basePath;
            for (String dir : dirs) {
                if (null == dir || "".equals(dir)){ continue;}
                tempPath += "/" + dir;
                try {
                    sftp.cd(tempPath);
                } catch (SftpException ex) {
                    LOG.error("basePath='" + basePath +"',tempPath='" + tempPath + "',sftpFileName='" + sftpFileName + "'", ex);
                    sftp.mkdir(tempPath);
                    sftp.chmod(0755, tempPath);
                    sftp.cd(tempPath);
                }
            }
        }
        sftp.put(input, sftpFileName);  //上传文件
        // 可选：设置上传文件的权限（如644，只读）
        //sftp.chmod(0644, sftpFileName);
    }


    /**
     * 下载文件。
     *
     * @param directory    下载目录
     * @param downloadFile 下载的文件
     * @param saveFile     存在本地的路径
     */
    public void download(String directory, String downloadFile, String saveFile) throws SftpException, FileNotFoundException {
        if (directory != null && !"".equals(directory)) {
            sftp.cd(directory);
        }
        File file = new File(saveFile);
        sftp.get(downloadFile, new FileOutputStream(file));
    }

    /**
     * 下载文件
     *
     * @param directory    下载目录
     * @param downloadFile 下载的文件名
     * @return 字节数组
     */
    public byte[] download(String directory, String downloadFile) throws SftpException, IOException {
        if (directory != null && !"".equals(directory)) {
            sftp.cd(directory);
        }
        InputStream is = sftp.get(downloadFile);

        byte[] fileData = IOUtils.toByteArray(is);

        return fileData;
    }

    /**
     * 下载文件
     *
     * @param directory    下载目录
     * @param downloadFile 下载的文件名
     * @return 字节数组
     */
    public InputStream downloadinput(String directory, String downloadFile) throws SftpException, IOException {
        if (directory != null && !"".equals(directory)) {
            sftp.cd(directory);
        }
//        int index = downloadFile.indexOf("/");
//        if (index == 0) {
//            downloadFile = downloadFile.substring(1, downloadFile.length());
//        }
        InputStream is = sftp.get(downloadFile);

        return is;
    }


    /**
     * 删除文件
     *
     * @param directory  要删除文件所在目录
     * @param deleteFile 要删除的文件
     */
    public void delete(String directory, String deleteFile) throws SftpException {
        sftp.cd(directory);
        sftp.rm(deleteFile);
    }


    /**
     * 列出目录下的文件
     *
     * @param directory 要列出的目录
     */
    public Vector<?> listFiles(String directory) throws SftpException {
        return sftp.ls(directory);
    }

    //上传文件测试
//    public static void main(String[] args) throws SftpException, IOException {
//        SFTPUtil sftp = new SFTPUtil("用户名", "密码", "ip地址", 22);
//        sftp.login();
//        File file = new File("D:\\图片\\t0124dd095ceb042322.jpg");
//        InputStream is = new FileInputStream(file);
//
//        sftp.upload("基础路径", "文件路径", "test_sftp.jpg", is);
//        sftp.logout();
//    }


    public ChannelSftp getSftp() {
        return sftp;
    }

    public void setSftp(ChannelSftp sftp) {
        this.sftp = sftp;
    }

    public Session getSession() {
        return session;
    }

    public void setSession(Session session) {
        this.session = session;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getPrivateKey() {
        return privateKey;
    }

    public void setPrivateKey(String privateKey) {
        this.privateKey = privateKey;
    }

    public String getHost() {
        return host;
    }

    public void setHost(String host) {
        this.host = host;
    }

    public int getPort() {
        return port;
    }

    public void setPort(int port) {
        this.port = port;
    }
}
